Classifieds at the time of posting this suggestion.

Unsolds are based on how long the listing has been up; Listing has been up 5 days and item been in the sellers inventory for 8 days? It has been unsold for 5 days.

The age of the listing(s) are shown in the screenshots rather than the last bump - Unsolds and item histories are presented in chronological order according to the screenshot(s).

x1 for sale at 2.4 Keys - http://i.imgur.com/sU9VAxr.png

Unsold for 3 days http://backpack.tf/item/932758307

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x1 for sale at 2.45 Keys - http://i.imgur.com/H1iIicV.png

Unsold for 8 days http://backpack.tf/item/557327992

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x1 for sale at 2.5 Keys - http://i.imgur.com/9BwSya9.png

Unsold for 3 days(Parts Attached) http://backpack.tf/item/1259681254

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x1 for sale at 2.6 Keys - http://i.imgur.com/pKrWPdM.png

Unsold for 13 hours http://backpack.tf/item/629422144

Outpost sellers.

http://www.tf2outpost.com/trade/28374740 - 2.48 Keys(2.5) - Unsold for 4 weeks - Autobumper.

I am excluding all trades on Outpost that haven't been bumped for 1 day or more.